auto merge of #8960 : Kimundi/rust/master, r=alexcrichton

Changed ToStr impl for Ascii
Added ToStr impl for char

Author: bors

src/libstd/char.rs

@@ -14,6 +14,8 @@ use option::{None, Option, Some};
 use int;
 use str::StrSlice;
 use unicode::{derived_property, general_category, decompose};
+use to_str::ToStr;
+use str;
 
 #[cfg(test)] use str::OwnedStr;
 
@@ -316,6 +318,13 @@ pub fn len_utf8_bytes(c: char) -> uint {
     )
 }
 
+impl ToStr for char {
+    #[inline]
+    fn to_str(&self) -> ~str {
+        str::from_char(*self)
+    }
+}
+
 #[allow(missing_doc)]
 pub trait Char {
     fn is_alphabetic(&self) -> bool;
@@ -502,3 +511,9 @@ fn test_escape_unicode() {
     assert_eq!(string('\u011b'), ~"\\u011b");
     assert_eq!(string('\U0001d4b6'), ~"\\U0001d4b6");
 }
+
+#[test]
+fn test_to_str() {
+    let s = 't'.to_str();
+    assert_eq!(s, ~"t");
+}

src/libstd/str/ascii.rs

@@ -60,7 +60,10 @@ impl Ascii {
 
 impl ToStr for Ascii {
     #[inline]
-    fn to_str(&self) -> ~str { str::from_bytes(['\'' as u8, self.chr, '\'' as u8]) }
+    fn to_str(&self) -> ~str {
+        // self.chr is allways a valid utf8 byte, no need for the check
+        unsafe { str::raw::from_byte(self.chr) }
+    }
 }
 
 /// Trait for converting into an ascii type.
@@ -506,4 +509,12 @@ mod tests {
             i += 1;
         }
     }
+
+    #[test]
+    fn test_to_str() {
+        let s = Ascii{ chr: 't' as u8 }.to_str();
+        assert_eq!(s, ~"t");
+    }
+
+
 }